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Hybrid ThorJack

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: Petitlu » Fri Mar 23, 2012 4:14 pm

I did some shooting this PM all flash, 3.5% BP, results:

- Test Mix20: I doubled the rupture disc, the explosion was contained ...

- Test MIX10: Explosion, strong shot and good impact in the galvanized steel of 2mm thickness, by level against noise, it's a fart fly ...

- Test without projectile MIX10: fair game, the disc is put through ...

[youtube]http://www.youtube.com/watch?v=V8W5S5CtKec[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 24, 2012 4:12 am

What are you using as a burst disk?
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Unread postAuthor: Petitlu » Sat Mar 24, 2012 4:15 am

disk cut from cans of "1664" steel :D



sometimes aluminum
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 24, 2012 4:31 am

Hmmm... bit overkill perhaps :D

I use photo paper!
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Unread postAuthor: Petitlu » Sat Mar 24, 2012 6:37 am

these are the discs that I use to Elurick.

HGDT he puts on the chamber pressure is 76bar and 150bar at MIX10 to Mix20! so you have a rupture disc for good solid performance!
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Unread postAuthor: Petitlu » Sun Mar 25, 2012 3:52 pm

hi
here's a shot at Mix15:
the plate is of the galvanized steel 2mm

[youtube]http://www.youtube.com/watch?v=xPp3NrfGHys[/youtube]
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Unread postAuthor: MrCrowley » Sun Mar 25, 2012 7:07 pm

Is it louder in real life? I know I've fired my small hybrid off a cliff on a very windy day and not heard much more than a huff but it seems like yours should sound reasonably loud in that environment. Is the camera microphone blocked by the tripod or anything?
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 25, 2012 11:41 pm

MrCrowley wrote:Is it louder in real life?


I ask myself the same question, granted it's a fairly long barrel but still...

That's pretty good performance though! I have a book at home about black powder weapons and they do some testing against 2mm steel, I will see if I can scan the relevant pages so you can compare :)
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Unread postAuthor: MrCrowley » Sun Mar 25, 2012 11:58 pm

jackssmirkingrevenge wrote:
MrCrowley wrote:Is it louder in real life?


I ask myself the same question, granted it's a fairly long barrel but still...
I just remembered that my chrony-breaking shot was so quiet that I thought something had gone wrong until I noticed the gun had moved back about 80cm and the video gave the impression of a powerful shot.

Must be something to do with wind and open areas. I can't remember the direction of the wind from the other day but it was windy, though I was down there again today and while still windy the shot was quite loud.
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 26, 2012 12:34 am

Maybe 'cause he's firing in a ditch coated with lovely noise absorbing grass?
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Unread postAuthor: Petitlu » Mon Mar 26, 2012 1:23 am

Hello!
noise is not louder in real life, when I was shooting at 3m and without ear protection.
Yesterday there was no wind ...
I did a test at MIX10 out of the ditch and the noise is the same.

Al-xg gave me this link:
http://www.thefirearmblog.com/blog/2007 ... t-shotgun/

ThorJack for this may be the same!
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 26, 2012 1:54 am

Petitlu wrote:ThorJack for this may be the same!


Possibly, here's some theory: http://guns.connect.fi/gow/arcane1.html
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Unread postAuthor: Petitlu » Mon Mar 26, 2012 2:15 am

I really think the lack of noise comes from this theory.
If I remove the barrel, it makes a big boom!
By cons I have to redo my Mix20 electrodes because the arc does not happen with my ignition flash.
I'm making an ignition with ignition coil, spark models, one with a spark plug filament ...
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Unread postAuthor: Petitlu » Mon Mar 26, 2012 4:40 am

diagram of the ignition that I will do if the flash is too low:

Image
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Unread postAuthor: dewey-1 » Mon Mar 26, 2012 7:49 am

That circuit will not work at drawn.
Where did you get that diagram?
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